C2 Differential Removal, Rotor Questions

[Mike S.]

Got my remaining trailing arm out of the '66 this morning. Its amazing how easy the right blades in a sawz-all can make this job - 20 minutes v. two hours on the other side.

I'll have both TAs professionally rebuilt, and I planned to keep my old rotors. I know minimum thickness for rotors is 1.215", but I don't know the thickness of a new rotor. Mine measure 1.25" and 1.24". Are they nearly new or nearly worn out? If they have to be trued to reduce runout, I know I'll lose some thickness. Is it time for new rotors?

My second question involves dropping the differential. I plan to do so by removing it while still attached to the crossmember, and I have already removed the tire carrier, half shafts, spring, and trailing arms. Is there anything I need to do on the front side, other than disconnecting the front bracket and the u-bolts securing it to the drive shaft? Do I need to mark any relative positions, remove the drive shaft, etc.?

Thanks for your help and advice.

[Joe L.]

Re: C2 Differential Removal, Rotor Questions

Mike-----

New rotor thickness is 1.250, so yours are at or very near new thickness. If they are still rivetted to the spindles, I strongly recommend leaving them that way. If they are not rivetted, mark their relative positions to the spindle anyway. If the runout is below .005", and preferably below about .002", no truing will be necessary. Truing the rotors will require the removal of some rotor thickness.

Nothing else needs to be done at the front of the differential carrier prior to removal other than what you've described. No marking or indexing is necessary for the driveshaft (who knows if it's in its factory-original position now, anyway). Have the driveshaft with new u-joints balanced as an assembly prior to re-installation.

[Mike S.]

Thanks and congratulations ......

on your impending retirement. How is the ZL-1 project coming? I'll be very interested when you finally post the details of your engine - items such as the heads, cam (probably a hydraulic roller), rods, etc.

Thanks again and best wishes,

Mike S

[Craig S.]

Re: Thanks and congratulations ......

Mike - me too! I bet Joe will use hypereutectic pistons too!...Craig